Meaning of CMOS and typical device mode: “CMOS” expands to “complementary metal-oxide-semiconductor,” and in mainstream logic processes the field-effect transistors are normally enhancement-mode devices. Is this statement correct?

Introduction / Context:CMOS stands for “complementary metal-oxide-semiconductor,” referring to the complementary use of p-channel and n-channel MOSFETs. Understanding the naming and the common operating mode of transistors in digital CMOS is fundamental to logic design.

Given Data / Assumptions:

• Complementary means paired pMOS and nMOS devices form logic functions (for example, CMOS inverters, NAND, NOR).
• Standard digital CMOS uses enhancement-mode MOSFETs whose channels form when a gate voltage exceeds a threshold in the appropriate polarity.
• Depletion-mode devices exist but are uncommon in standard-cell digital logic paths.

Concept / Approach:Digital CMOS relies on enhancement-mode devices so that, at steady state, either the pull-up or pull-down network is off, minimizing static current. The phraseology in the question is slightly pluralized, but the technical substance—expansion of CMOS and enhancement-mode usage—is correct.

Step-by-Step Solution:

Verification / Alternative check:Semiconductor texts and process overviews confirm enhancement-mode devices in mainstream CMOS logic libraries.

Why Other Options Are Wrong:

Common Pitfalls:Confusing analog specialty processes (where depletion loads may appear) with mainstream digital logic; misremembering the expansion of CMOS.

Final Answer:Correct